Tractor position icon is far above or below the surface.

Symptoms:

When implementing the position icon appears to be a long way above or below the surface (the tractor icon will normally rise to surface height if it is below the surface, but as-applied cuts will be far too deep).

Cause:

The zero value has been incorrectly set, or the base station elevation has changed since zeroing.

Solutions:

1. Re-zero the T3RRA software
2. Check to see that the base station coordinates have not changed. If they have, return them to the original coordinates (latitude, longitude, height).
3. Be sure to save your project if you believe you will need to finish implementation at a later date in order to retain the zero value.